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Патент USA US2123341

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July 12, 1938.
B_ OFFEN
‘
2,123,341
DRYING METHOD AND APPARATUS
?led Nov. 26, 1935
my.2.
N
N
INVENTOR.
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EfKN/MD OFFE/V
BY 44M“ 91/
A TTORNEY.
'
Patented July 12, 1938
2,123,341
UNITED STATES PATENT OFFICE
2,123,341
name METHOD AND APPARATUS ’
_
Bernard Often, Chicago, 111.
Application November 26, 1935, Serial No. 51,563
8 Claims. (Cl. 34—24)
This invention relates to drying.
the insulating effect of this ?lm, the air supplied
This application is a continuation in part of
my co-pending application, Serial No. 6,453 filed
February 14, 1935.
Ol
‘
-
The general object of the invention is to pro
vide an improved method of and apparatus for
drying materials of various description, particu
larly freshly inked paper, textiles, chemicals, and
the like.
10
'
It has been general practice in the drying art
to dry materials by passing the materials under
a hood or through a tunnel-like enclosure.
20
To
must be at a relatively high temperature, in order
that the heat may penetrate through the film to
the inked surface and cause the solvents to vapor
ize.
According to the present invention, applicant
breaks up and disperses this film by impinging
thereagainst streams of air at high pressure and
at high velocity. These streams of air also dis
perse the small volumes of air contained between 10
the irregularities of the surface. The dispersion
of the ?lm permits the drying air to heat the sur
this tunnel-like enclosure is supplied air at pre
determined temperatures to accomplish the re
quired drying. The temperature of the air is
varied, in accordance with the nature of the ma
terial to be dried, the speed at which the material
is to be dried, and the characteristics of the ma
face directly and to convey vapors from the sur
face, inasmuch as the drying air and the surface
are thus brought into direct and intimate contact.
,By breaking up this ?lm and dispersing the air
terial with relation to heat.
content of solvents and water vapors, as well as
'
between the particles, applicant continually
brings to the printed surface air that has a small
when freshly inked surfaces are passed through ' a desired temperature to assist in liberating the
a tunnel-like enclosure or hood for drying, the
solvents. In thisv way applicant e?’ects more
air supplied thereto at predetermined tempera
tures absorbs the solvents and water vapors given
off by the inked surfaces. In addition, the air
rapid liberation of the solvents, and through the
dispersement of the volumes close to the inked
surface, accomplishes the liberation and removal
25 acts as a medium to heat the surface to bring
about a vaporization of the solvents and the
water of the ink. The higher the temperature
of the air supplied, the more readily will the
of the solvents with a smaller air volume and also 25
with a lower air temperature. This lower tem
perature is important since it does not soften
some of the ingredients of the ink.
Further, the turbulent action caused by the
high pressure air brings the drying air more fre 30
quently in contact with the printed surface with
the result that there is greater vapor absorption
yond a certain point. For this reason, the tem- . by the air. This brings about more rapid and
more .ef?cient drying, permits drying at lower"
perature of drying air is maintained at a rela
temperatures in view of the better contact with 3
35 tively low point, but large air volumes are used
to sweep away from the surface ‘the vapor laden the surface, and permits the use of smaller, more
air so that the vapors can readily vaporize into economical apparatus.
A feature of the invention resides in supplying
air not laden with solvents or water vapors.
inked surface give up its solvents.
30
#
In the drying of inked surfaces. certain ingredi
cuts of the ink are materially softened by high
temperatures. This becomes objectionable be
‘ The surface of a freshly inked web is rough and '
40 irregular, due to the little ,crevices and spaces in
between the various inked particles on the sur
face. This inked paper travels at a high rate
ofspeed, as for example,,between 500 and 1500
feet a. minute. At such a speed, and with the ir
regular printed surface, the paper in traveling
along, carries a film of air along with it. This
> film, which blankets the paper, becomes saturated
quickly with solvents or water vapors, and retards
the liberation of vapors from the surface. In
present-day practice, large air volumes are re
quired to e?ect penetration of this film, so that
air to material to be dried, removing‘the air after
it has contacted the material,v and impinging 40
other air in. the form of high pressure,'high ve- T
locity streams against the material.
Another feature of the invention resides in sup
plying air to material to be dried at a first point,
removing ‘said air at a second point, moving. the- 4.
material to be dried relative to said points, and
impinging jets' of other air against the material.
Another feature of the invention resides in dry
.ing a material by impinging thereagainst air in
the form of high pressure, high velocity streams.‘
6
Another feature of the invention resides in sup
.the freshly-introduced and relatively vapor-free plying a first volume of air to a surface to' be
air may pick up solvents and vapor from the sur
dried, impinging a second volume of air against
face, and in order to maintain an overall low the surface in the form of high velocity high
65 vapor content in the air. Moreover, because of ‘ pressure streams, removing said volumes of air ..
through pipe 29. The cooled air is fed through
pipe 30, preferably equipped with a suitable pres
face in the form of high velocity high pressure sure regulating valve 3|,’ to the manifold 32,
streams, the temperature of said third air volume . whence it is discharged against the web 6, after
being lower than that of the ?rst and second air the web has been subjected to the drying action
after they have contacted the surface, and then
impinging a third volume of air against the sur
volumes.
Neither, either or both of the ?rst and
" second air volumes may be heated to hasten the
drying of the material. >When warm air is used
it has a tendency in some cases to soften the in
10 gredients of the material. By subjecting the ma
terial to the action of a cooled third volume of
air, applicant chills the material, or at least the
surface of the'material, hardening thesame, and
thus preparing the material for subsequent treat
15 ment. As will be understood, the expansion of
the compressed air of the third volume brings
about a chilling effect which‘ supplements that
caused by the initially low temperature of the
of air frompassage i3 and jets 21. ,\Air is 'dis- .
charged from manifold 32 through jets 33 in a
plurality of high pressure high velocity streams
which chill the web, or rather the inked surface
of the web, and thus prepare it for further treat 10
ment.
\
Fig. 2 illustrates the application of the inven
tion to a drier of the tunnel type. Heated air
is introduced to the tunnel 40v through supply
duct 4|, and after contact with material 42, to
be dried, is removed through duct 43. Compressed
air is supplied through pipe 44, corresponding to
pipe 24 of Fig. 1, to manifold 45, whence it is dis
charged in the form. of a plurality .of high
third air volume.
.
Other objects, features and advantages of the .velocity high pressure streams through jets 48. 20
In the drying of chemicals on trays or conveyors _
invention will be more apparent from the fol
lowing description of the invention to be read in of any form, to which applicant's invention is
connection with the accompanying drawing in suited, it is customary to provide a heating means
which:
in the tunnel. In the drying of textiles it is
Fig. 1 diagrammatically represents one form of usually necessary to provide a hot plate over
applicant's invention, utilizing a drying hood; and which the material passes. Applicant's invention
Fig. 2 is a diagrammatic view'illustrating the supplements these and similar arrangements, and
application of the invention to a tunnel drying does not con?ict with them in any respect.
system.
-
Turning now to the drawing, 5 represents gen
erally a drying hood similar to that disclosed in
my co-pending application, Serial No, 6,453, ?led
February 14, 1935. Under the hood is passed a
web of paper 6, or the like, to be dried, carried
on rollers 1. Air is drawn into the system by
fan I, driven by motor 9, and is supplied to hood
I through duct l0. If desired, the intaken air
may be heated by heater ll. Inside the hood 5
air is supplied to discharge port l2 through
' passage l3. ‘The air discharged from port l2
If desired, drying maybe affected solely by
the high pressure high velocity air streams and
heating.
.
Since many modi?cations maybe made in the
invention without departing from the scope there
of, it is intended that the foregoing description
and accompanying drawing be regarded as illus
trative only, applicant limiting himself only as
indicated in the appended claims.
I claim:
‘
1. A method of drying a printed surface of
a web consisting in passing the web through a 40
contacts the web 6, and is drawn off through ex-. "con?ning hood, discharging a main volume of
haust ports i4, and discharge duct i5, under the air within the hood in a condition capable of ef-,
in?uence of discharge fan It, driven by motor I1. 'fecting drying of a freshly printed surface, dis
ll represents a dehydrator, iii an air cleaner, charging a. secondary smaller volume of air with
in the hood at a velocity much greater than that
"an air heater, and 2| anyair pre-cooler. Com
pressed air is supplied to dehydrator l8 through. of the velocity of discharge of the main volume,
the secondary volumeibeing directed at the web
pipe v22, from any suitable source. The com
pressed air, dehydrated and cleaned, is divided at \ to break up ?lm forming at the printed surface.v
2. A method of drying a printed web consisting
23, part of the compressed air being ‘routed
through heater 20, and part of the compressed in passing the web through a con?ning hood,
discharging a main volume of air within the hood
air being routed through pre-cooler “2|. Com
ressed air from heater 2|! is passed through pipe
,4, equipped with a pressure regulating valve‘ 25,
for drying the web, simultaneously discharging a
to mani‘foldm? disposed within the hood 5. Air
iii-om manifold 26 is discharged at high velocity
and at high pressure through a plurality of jets
I1, directed against web 6. The high pressure,
considerably higher than the discharge velocity
bigh velocity air streams break up the ?lm of
solvent laden air which forms a blanket ‘along the
surface of web 6 and thus facilitates drying of
the web. Further, the high pressure air dis
pers'es the minute air volumes limmediately sur
rounding the small particles of ink applied to the
surface, and thus permits contact of the fresh
air with the large exposed area offered by the
small ink particles.
This direct and effective‘
‘contact and continual change vof the air im
-mediately in contact with the small inked
particles, make for rapid and ‘efficient drying.
The air introduced through jets 21 is passed
from the'hood through discharge duct is.
second volume of air within the hood at a velocity
of said main volume of air in the form of small 55
streams of- air impinging forcefully against the
web, and relieving air from the hood.
- 3. The method of drying a web which consists
in passing the web through a con?ned space, ad
mitting within said space air in a condition capa
ble of effecting drying of the web and passing such“.
air adjacent said web, withdrawing said air from
the vicinity of the web and from said space after
it has passed adjacent said web and exerted a
drying action thereon, and discharging a sec
ondary smaller volume of air within said space
at a velocity much greater than that at which
said ?rst mentioned air is/passed adjacent the
web, the secondary air volume being directed at
and impinged against the web to prevent the 70
formation of film at the web surface or to break
Air in the cooler 2| is cooled by a cooling . up such ?lm if formed.
medium introduced through pipe 28 and removed
'
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BERNARD OFFEN.
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